body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}


nav {
    background: #2c3e50;
    padding: 10px;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

nav ul li a:hover {
    text-decoration: underline;
}

header, section {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.1);
}

button {
    background: #3498db;
    color: white;
    padding: 10px 15px;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}

button:hover {
    background: #2980b9;
}